公开(公告)号：US20090245815A1

公开(公告)日：2009-10-01

申请号：US12320740

申请日：2009-02-03

申请人： Huijian ZHANG ,  Lei LI ,  Zhenning TAO ,  Hisao NAKASHIMA

发明人： Huijian ZHANG ,  Lei LI ,  Zhenning TAO ,  Hisao NAKASHIMA

IPC分类号： H04B10/06

CPC分类号： H04B10/6161 ,  H04B10/61 ,  H04B10/6164 ,  H04B10/63

摘要： The present invention discloses a frequency offset detecting apparatus and method for use in a digital coherent optical receiver. The digital coherent optical receiver comprises: a front-end processing section for generating a digital baseband electric signal; an equalizer for performing equalized filtering on the digital baseband electric signal; and the frequency offset detecting apparatus for detecting frequency offset contained in the digital baseband electric signal or frequency offset contained in a signal outputted by the equalizer; wherein the frequency offset detecting apparatus comprises an argument difference obtaining unit, a first subtracter, a second subtracter, a quantizer and an averager, of which the argument difference obtaining unit obtains an argument difference of adjacent symbols in a signal inputted therein; the first subtracter subtracts an output of the averager from the argument difference obtained by the argument difference obtaining unit; the quantizer performs uniform quantization with predetermined intervals on an output of the first subtracter; the second subtracter subtracts an output of the quantizer from the argument difference obtained by the argument difference obtaining unit; and the averager averages an output of the second subtracter.

摘要翻译： 本发明公开了一种在数字相干光接收机中使用的频偏检测装置和方法。 数字相干光接收机包括：前端处理部分，用于产生数字基带电信号; 均衡器，用于对数字基带电信号进行均衡滤波; 以及频率偏移检测装置，用于检测包含在由均衡器输出的信号中的数字基带电信号或频率偏移中的频率偏移; 其中，所述频偏检测装置包括自变量差分获取单元，第一减法器，第二减法器，量化器和平均器，其中所述变差差获取单元获取其中输入的信号中的相邻符号的自变量差; 所述第一减法器从由所述变元差分获取单元获得的自变量差中减去所述平均器的输出; 量化器在第一减法器的输出上以预定间隔执行均匀量化; 所述第二减法器根据由所述自变量差获取单元获得的参数差减去所述量化器的输出; 并且平均器对第二减法器的输出进行平均。

公开(公告)号：US20100092168A1

公开(公告)日：2010-04-15

申请号：US12567245

申请日：2009-09-25

申请人： Lei LI ,  Zhenning TAO ,  Hisao NAKASHIMA

发明人： Lei LI ,  Zhenning TAO ,  Hisao NAKASHIMA

IPC分类号： H04B10/08

CPC分类号： H04B10/611 ,  H04B10/0795 ,  H04B10/60

摘要： The present invention relates to an optical coherent receiver and an apparatus for and a method of monitoring performance thereof. The apparatus for monitoring performance of the optical coherent receiver makes use of a first signal and a second signal from the optical coherent receiver to monitor performance of the optical coherent receiver, and comprises a first subtracter, for subtracting the second signal from the first signal to obtain a first subtraction result; a squarer, for obtaining a square of the first subtraction result; a delayer, for delaying the first subtraction result; a multiplier, for multiplying the first subtraction result with the delayed first subtraction result; and a second subtracter, for subtracting the result of the multiplier from the result of the squarer.

摘要翻译： 本发明涉及一种光学相干接收机及其监视性能的装置和方法。 用于监视光学相干接收机的性能的装置利用来自光学相干接收机的第一信号和第二信号来监测光学相干接收机的性能，并且包括第一减法器，用于从第一信号减去第二信号 获得第一个减法结果; 平方，用于获得第一减法结果的平方; 延迟器，用于延迟第一减法结果; 乘法器，用于将第一减法结果与延迟的第一减法结果相乘; 和第二减法器，用于从平方器的结果中减去乘数的结果。

公开(公告)号：US20120051742A1

公开(公告)日：2012-03-01

申请号：US13221312

申请日：2011-08-30

申请人： Lei LI ,  Zhenning TAO ,  Takeshi HOSHIDA

发明人： Lei LI ,  Zhenning TAO ,  Takeshi HOSHIDA

IPC分类号： H04B10/08 ,  H04B10/04 ,  H04B10/00 ,  H04B10/06

CPC分类号： H04B10/0795 ,  H04B10/255 ,  H04B10/6163

摘要： The present invention provides apparatus for self-phase modulation noise calculation, apparatus for self-phase modulation noise elimination and optical coherent receiver. The apparatus for calculation comprises: a signal receiver to receive an input signal; a calculator connected to the signal receiver to calculate a self-phase modulation noise at the current instant by using the signal powers of an input signal waveform at the current instant and at several sampling instants adjacent to the current instant. The embodiments of the present invention calculates the self-phase modulation noise at a certain instant by using the signal powers at a plurality of digital sampling periods before and after this instant, and when the apparatus is used to calculate the self-phase modulation noise of each of the sub-spans in an optical fiber transmission link, in case that the calculation precision is ensured, the granularity of the sub-spans may be reduced, thereby lowering the complexity of the calculation.

摘要翻译： 本发明提供了用于自相位调制噪声计算的装置，用于自相位调制噪声消除的装置和光学相干接收机。 该计算装置包括：接收输入信号的信号接收器; 连接到信号接收器的计算器，通过使用当前时刻的输入信号波形的信号功率和与当前时刻相邻的几个采样时刻来计算当前时刻的自相位调制噪声。 本发明的实施例通过在该时刻之前和之后的多个数字采样周期中使用信号功率来计算某一时刻的自相位调制噪声，并且当该装置用于计算自相位调制噪声的自相位调制噪声 在光纤传输链路中的每个子跨度，在确保计算精度的情况下，可能减小子跨度的粒度，从而降低计算的复杂度。

公开(公告)号：US20080205905A1

公开(公告)日：2008-08-28

申请号：US12026782

申请日：2008-02-06

申请人： Zhenning TAO ,  Lei Li ,  Jens C. Rasmussen

发明人： Zhenning TAO ,  Lei Li ,  Jens C. Rasmussen

IPC分类号： H04B10/06 ,  G06E1/04 ,  G06F17/10

CPC分类号： H04B10/6165 ,  H04B10/61 ,  H04B10/611 ,  H04B10/613

摘要： The present invention provides a digital phase estimator, a digital phase locked loop and an optical coherent receiver. The optical coherent receiver comprises a local oscillator laser, for supplying a local oscillator optical signal; an optical 90 degree frequency mixer, for mixing a received optical signal with the local oscillator optical signal; first and second balancing photoelectric detectors, for converting the optical signals outputted from the optical 90 degree frequency mixer into baseband electrical signals; first and second A/D converters, for respectively converting output signals from the first and the second balancing photoelectric detectors into digital signals; a digital phase locked loop, for compensating a phase difference between a carrier signal of the received optical signal and the local oscillator optical signal, and outputting the compensated signal; and a data recovering unit, for recovering data from the compensated signal.

摘要翻译： 本发明提供数字相位估计器，数字锁相环和光学相干接收器。 光学相干接收器包括用于提供本地振荡器光信号的本地振荡器激光器; 用于将接收到的光信号与本地振荡器光信号混合的光学90度混频器; 第一和第二平衡光电检测器，用于将从光学90度混频器输出的光信号转换成基带电信号; 第一和第二A / D转换器，用于将来自第一和第二平衡光电探测器的输出信号分别转换成数字信号; 数字锁相环，用于补偿所接收的光信号的载波信号与本地振荡器光信号之间的相位差，并输出补偿的信号; 以及数据恢复单元，用于从补偿信号中恢复数据。

公开(公告)号：US20120076235A1

公开(公告)日：2012-03-29

申请号：US13212543

申请日：2011-08-18

申请人： Liang DOU ,  Zhenning TAO

发明人： Liang DOU ,  Zhenning TAO

IPC分类号： H04L25/03

CPC分类号： H04B10/2543 ,  H04B10/2939

摘要： The present invention provides nonlinear compensating apparatus and transmitter. The nonlinear compensating apparatus comprises: an information acquiring unit to acquire a symbol information sequence of the pulse information input by a transmitting side; a perturbation quantity calculating unit to calculate the weighted sum of the interaction of the pulses of several items at several different instants relative to the current instant, to obtain the perturbation quantity produced by the current instant nonlinear effect on a transmission link of a certain length; and an information compensating unit to compensate for the symbol information sequence of the pulses at the current instant acquired by the information acquiring unit by using the perturbation quantity obtained by the perturbation quantity calculating unit, so as to obtain the symbol information sequence compensated at the current instant to cause the transmitting side to transmit signals according to the compensated symbol information sequence. The apparatus corrects the symbol information sequence of the pulse signals input by a transmitting side, with the complexity of calculation being low, and the apparatus is applicable to single-polarization and dual-polarization multiplexing systems, and at the same time, compatible with any modulation format.

摘要翻译： 本发明提供非线性补偿装置和发射机。 非线性补偿装置包括：信息获取单元，用于获取由发送侧输入的脉冲信息的符号信息序列; 扰动量计算单元，用于计算在若干不同时刻相对于当前时刻的若干项目的脉冲的相互作用的加权和，以获得由当前时刻非线性效应产生的对某一长度的传输链路产生的扰动量; 以及信息补偿单元，用于通过使用由扰动量计算单元获得的扰动量来补偿由信息获取单元获取的当前时刻的脉冲的符号信息序列，以便获得当前所补偿的符号信息序列 立即使发送侧根据经补偿的符号信息序列发送信号。 该装置校正由发送侧输入的脉冲信号的符号信息序列，其计算的复杂度低，并且该装置可应用于单极化和双偏振复用系统，并且同时兼容任何 调制格式。